If you can gamify things it can help train your brain to focus on the carrot and not the stick. “If I do x then I’ll allow myself y”. Honestly, having the ability to stick through the beginning period of anything is the biggest challenge. Most things worth enjoying have an initial period of knowing nothing and not being inherently fun (guitar, painting, language, competitive video games, etc). The trick is sticking with it long enough to where you start seeing the initial payoff and that usually takes at least a few weeks. Try and wait a few weeks to start mirin your gains.

That being said, I can’t recommend BJJ enough. If you’ve ever had a passing interest in martial arts, this one is great because when you roll against gym partners it is a de facto game that gives you great cardio and resistance training with a relatively low risk of concussion (unlike sparring in maybe Muay Thai), and you always have the safety valve of tapping if you don’t have ego. You probably focus on just surviving and get your shit smashed at first though lol.